A person applies a sine wave and square wave to an AND gate as shown in the figure (i) and (ii). Assuming that both the voltages are applied in phase, the person observes the output at 
and 
on (i) and (ii), respectively. [Assume minimum voltage of 
is equivalent to logic (i)]
Sine wave, 
.
Sine wave, 
Square wave, 
Sine wave, 
and square wave at 
. 
and square wave at 
. 
. 
.
Text Solution
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Given,
(i) Sine wave, 
Square wave 
In figure (i), sine wave and square wave both have different frequency, respectively, 
and 
. Hence, these voltages are not processed by AND gate, therefore, no output is obtained from gate (i).
(ii) Sine wave, 
Square wave 
In figure (ii), sine wave and square wave both have same frequency of 
, hence, these voltage are processed by AND gate. Since, logic gate (AND gate) gives output in two level ( 0 and 1 ) only at same frequency of input. Whenever sine wave has value between 
and to 
we get output 1 . Therefore, the output of gate (ii) will be pulsed wave of 
.
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